'date']; public function purchaseOrder() { return $this->belongsTo(PurchaseOrder::class); } public function supplier() { return $this->belongsTo(Supplier::class); } public function warehouse() { return $this->belongsTo(Warehouse::class); } public function items() { return $this->hasMany(GrnItem::class); } public function receivedBy() { return $this->belongsTo(\App\Models\User::class, 'received_by'); } }